MIL-S-6551A(USAF)
pressure through a 1/4 inch hydraulic hose line, connected to the catapult, to fire the catapult cartridge. The initiator and hydraulic hose line are included in the catapult assembly. The length of the hydraulic hose line as furnished may be reduced to suit the seat installation but it shall not be less than four feet. The initiator shall be installed on the seat in a position as close to the ejection ring as possible.
3.2.15 |
Ejection |
rails. A set of ejection rails shall be furnished with the |
seat. slide |
The rails blocks and |
shall be of a cross section to accommodate the rollers or to support the loads imposed by the strength requirements |
of the seat. The ejection rails shall be made sufficiently rigid to prevent
any deflection which would cause binding of the rollers or slide blocks or allow them to jump the rails. In the airplane it is intended that the rails will extend downward as far as possible to provide a maximum of seat
guidance during ejection.
3.2.16 Drain holes. Drain holes shall be provided in the bottom of the seat and in the parachute shelf or ledge to drain the seat bottom and parachute shelf or ledge when the airplane is in the normal or ground attitude.
3.2.17 Ejection rollers. The center line of the ejection rollers or slide blocks shall be parallel to the seat back. In order to provide a maximum of guided travel of the seat in the rails, the rollers or slide blocks shall
be mounted as high as practicable on the seat.
3.2.18 Attachment. The attachment of the catapult to the seat shall be made through a fitting on the seat frame (See Figure 1) which shall receive the block of the personnel catapult. Installation dimensions for the catapult are covered by Frankford Arsenal Drawing BLX-74-12, entitled
"Catapult, Aircraft Personnel, T9E3(M-4) Installation Dimensions" and Drawing BLX-32-4, entitled, "Initiator, M-3 Aircraft Personnel Catapult, Installations Dimensions."
3.2.19 Safety wire. Safety or lock wire shall not be used to secure the ejection controls, leg braces, foot restraints, etc, in the locked or retracted position.
3.3 Construction.
3.3.1 Methods. Riveting or welding may be used for assembly of component parts fabricated of metals which are suitable for this type of construction. Fittings and joints which will require disassembly for installation or removal of the seat from the airplane or for disassembly of the component parts of the seat shall be bolted.
3.3.2 Projection. The inside surfaces of the seat shall be free from projections which could catch or damage by abrasion the parachute pack or
the clothing of the crew member. The exterior surfaces of the seat shall be free from sharp edges or any projection which might scratch the hands or clothing of the crew member as he moves his arms about the sides of the seat to handle equipment within his reach to the rear and to the side. The seat design shall be free of all projections which might foul personal equipment
or jeopardize operation of other seat components.
Source: https://assist.dla1.m4il -- Downloaded: Check the source to verify that this is the current version before use.
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